| From: | Jim Finnerty <jfinnert(at)amazon(dot)com> |
|---|---|
| To: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Query Performance Issue |
| Date: | 2018-12-29 12:00:05 |
| Message-ID: | 1546084805706-0.post@n3.nabble.com |
| Views: | Whole Thread | Raw Message | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
Try a pg_hint_plan Rows hint to explore what would happen to the plan if you
fixed the bad join cardinality estimate:
/*+ rows(prm prc #2028) */
alternatively you could specify a HashJoin hint, but I think it's better to
fix the cardinality estimate and then let the optimizer decide what the best
plan is.
I agree with Justin that it looks like the version and
recommended_content_id columns are correlated and that's the likely root
cause of the problem, but you don't need to upgrade to fix this one query.
-----
Jim Finnerty, AWS, Amazon Aurora PostgreSQL
--
Sent from: http://www.postgresql-archive.org/PostgreSQL-performance-f2050081.html
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Jim Finnerty | 2018-12-29 12:17:33 | Re: Optimizer choosing the wrong plan |
| Previous Message | Justin Pryzby | 2018-12-29 07:15:35 | Re: Query Performance Issue |